| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf ball 2 excellent in flight performance and controllability.SOLUTION: A golf ball 2 includes a core 4, an inner cover 6, and an outer cover 8. The core 4 includes a center 10, and an inner envelope layer 12. The inner envelope layer 12 is formed by a rubber composition being crosslinked. The rubber composition includes: a base rubber (a); a co-crosslinking agent (b); a crosslinking initiator (c); and an acid and/or a salt (d). The co-crosslinking agent (b) is: (b1) an α, &bgr;-unsaturated carboxylic acid having 3 to 8 carbon atoms; or (b2) a metal salt of an α, &bgr;-unsaturated carboxylic acid having 3 to 8 carbon atoms. The hardness Hi of the inner cover 6 is larger than the hardness Hs of the surface of the core 4. The hardness Ho of the outer cover 8 is smaller than the hardness Hi. |
